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<html><head><title>XLISP apply</title>
<link rel="stylesheet" type="text/css" href="reference.css">
</head>
<body>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
<a href="../tutorials/tutorials.htm">Tutorials</a> |
<a href="../examples/examples.htm">Examples</a> |
<a href="reference-index.htm">Reference</a>
<hr>
<h1>apply</h1>
<hr>
<p><table cellpadding="0" cellspacing="0" style="margin-left:10px"><tbody>
<tr valign="top">
<td><nobr>Type:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>function (subr)</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>xlbfun.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<p><div class="box">
<dl>
<dt>(<b>apply</b> <i>function args</i>)</dt>
<dd><i>function</i> - the function or symbol to be applied to 'args'<br>
<i>args</i> - a list that contains the arguments to be passed to 'function'<br>
returns - the result of applying the function to the arguments</dd>
</dl>
</div></p>
<h2>Description</h2>
<p>The 'apply' function causes 'function' to be evaluated with 'args' as the
parameters, returning the result of 'function'. The 'args' argument must be
a list.</p>
<h2>Examples</h2>
<pre class="example">
> (defun my-add (x y) <font color="#008844">; define MY-ADD function</font>
(+ x y))
MY-ADD
> (my-add 1 2) <font color="#008844">; ordinary function call</font>
3 <font color="#008844">; returns 3</font>
> (apply #'my-add '(2 4)) <font color="#008844">; symbol-function applied to argument-list</font>
6 <font color="#008844">; returns 6</font>
</pre>
<p><b>Note:</b> When using 'apply' to cause the evaluation of a function,
you can use the <nobr>sharp-quoted</nobr> name of the function like
#'my-add in the example, or <nobr>(function my-add)</nobr>. <nobr>In
XLISP</nobr> also <nobr>'my-add</nobr> and <nobr>(quote my-add)</nobr> work,
but this is no good Lisp style.</p>
<p>See also:</p>
<ul>
<li><nobr>Contents → <a href="../manual/contents.htm#evaluation-functions">Evaluation Functions</a></nobr></li>
</ul>
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<a href="../manual/contents.htm">Contents</a> |
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